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Help me at least with one exercise

Calculate:

a) The density of the gasoline knowing that a 500 L drum has a mass of 430 Kg.
b) The mass of a piece of glass with a volume of 10 cm3, knowing that the density of the glass is 2.2 g/cm3.
c) The volume of a steel ball of 14 g of mass if the dsteel = 5500 Kg/m3.
d) The mass of 1 L of olive oil (d= 0,85 g/cm3).